CCC stores authentication credentials that facilitate automated backup tasks in the macOS System keychain. Specifically, CCC will store these sorts of credentials:
- SMTP account settings that you define in CCC's Preferences > Email Settings
- NAS device username/password for mounting NAS volumes specified as a source or destination to a CCC task
- Encrypted volume passwords that you ask CCC to store
- Encrypted disk image passphrases for disk images that you ask CCC to create
You can remove individual keychain entries, or remove all CCC-added keychain items from the macOS System keychain
If you would like to see and/or remove individual keychain entries, open CCC's Settings window and click Passwords in the toolbar. To remove a keychain entry, simply select the entry and press the Delete key. Click Reset Keychain to remove all CCC-created entries from the System keychain.
You can also see CCC-created keychain entries in the System keychain via the Keychain Access application. Open Keychain Access, then select the System keychain in the sidebar. All CCC-created entries are prefixed with "CCC".